Constant Py_TPFLAGS_BASE_EXC_SUBCLASS
pub const Py_TPFLAGS_BASE_EXC_SUBCLASS: u64 = _; // 1_073_741_824u64Available on crate feature
tls only.pub const Py_TPFLAGS_BASE_EXC_SUBCLASS: u64 = _; // 1_073_741_824u64tls only.